Insert a node at the head of a linked list

# Complete the insertNodeAtHead function below.

#
# For your reference:
#
# SinglyLinkedListNode:
#     int data
#     SinglyLinkedListNode next
#
#
def insertNodeAtHead(llist, data):
     node=SinglyLinkedListNode(data)
     node.next=llist
     return node